Saez, who's known for his work on the income gap, has highlighted a surprising and discouraging fact: during the post-recession period of 2009 and 2010, the rich snagged a greater share of total income growth than they did during the boom years of 2002 to 2007.

In other words, inequality has been even more pronounced under Obama than it was under George W. Bush.

You might likewise not be surprised if you already knew that some household-goods companies are catering to this new reality by quietly neglecting their mid-price product lines, focusing instead on their high-end and budget offerings, since wages are diverging so much. Or if you knew that the U.S. ranks closer to China, Serbia and Rwanda than any other country in the developed world when it comes to income inequality.

It was only a few months ago that the Congressional Budget Office released a report illustrating how the very richest Americans have pulled away from the rest of society in the past 30 years.

But that report used data that was only complete through 2007. Saez's calculations go through 2010, suggesting that White House rhetoric or no, the trends of the past three decades haven't started to reverse themselves.

Here's how Saez's math breaks down, for the curious: In the 2009-2010 period, a time of modest economic growth, the top 1 percent of U.S. earners captured 93 percent of all the income growth in the country.

Got that? Now compare it to how the mega-rich made out during the Bush upswing years of 2002 to 2007. During that time, the top 1 percent of earners captured just 65 percent of all the income growth.

That means the rising tide has lifted fewer boats during the Obama years -- and the ones it's lifted have been mostly yachts.